from flask import request, jsonify, current_app
from datetime import datetime, timedelta
from app import db
from app.models import Product, License, Device, Version
from app.utils.crypto import generate_hash, verify_hash, generate_signature
from . import api_bp

@api_bp.route('/auth/verify', methods=['POST'])
def verify_license():
    """验证卡密接口"""
    try:
        data = request.get_json()
        if not data:
            return jsonify({
                'success': False,
                'message': '请求数据为空'
            }), 400

        # 获取请求参数
        software_id = data.get('software_id')
        license_key = data.get('license_key')
        machine_code = data.get('machine_code')
        timestamp = data.get('timestamp')
        signature = data.get('signature')

        # 验证必填参数
        if not all([software_id, license_key, machine_code, timestamp, signature]):
            return jsonify({
                'success': False,
                'message': '缺少必要参数'
            }), 400

        # 验证时间戳（防止重放攻击）
        try:
            request_time = datetime.fromtimestamp(int(timestamp))
            # 增加时间验证的宽容度到5分钟（300秒）
            time_diff = abs((datetime.utcnow() - request_time).total_seconds())
            if time_diff > 300:  # 5分钟有效期
                return jsonify({
                    'success': False,
                    'message': '请求已过期'
                }), 400
        except (ValueError, TypeError):
            return jsonify({
                'success': False,
                'message': '时间戳格式错误'
            }), 400

        # 验证签名
        secret_key = current_app.config.get('AUTH_SECRET_KEY', 'default-secret-key')
        signature_data = f"{software_id}{license_key}{machine_code}{timestamp}"
        expected_signature = generate_signature(signature_data, secret_key)
        
        # 调试信息（仅在调试模式记录，且不输出密钥）
        if current_app.debug:
            current_app.logger.debug(f"签名数据: {signature_data}")
            current_app.logger.debug(f"客户端签名: {signature}")
            current_app.logger.debug(f"服务端签名匹配: {signature == expected_signature}")

        if signature != expected_signature:
            return jsonify({
                'success': False,
                'message': '签名验证失败'
            }), 401

        # 查找产品
        product = Product.query.filter_by(product_id=software_id).first()
        if not product:
            return jsonify({
                'success': False,
                'message': '产品不存在'
            }), 404

        if not product.is_enabled():
            return jsonify({
                'success': False,
                'message': '产品已禁用'
            }), 403

        # 查找卡密
        license_obj = License.query.filter_by(
            license_key=license_key,
            product_id=software_id
        ).first()

        if not license_obj:
            return jsonify({
                'success': False,
                'message': '卡密不存在'
            }), 404

        # 验证卡密
        software_version = request.json.get('software_version', '1.0.0') if request.json else '1.0.0'
        success, message = license_obj.verify(machine_code, software_version)
        if not success:
            return jsonify({
                'success': False,
                'message': message
            }), 403

        # 处理首次激活
        if license_obj.status == 0:  # 未激活
            software_version = request.json.get('software_version', '1.0.0') if request.json else '1.0.0'
            success, message = license_obj.activate(
                machine_code,
                software_version
            )
            if not success:
                return jsonify({
                    'success': False,
                    'message': message
                }), 403

        # 更新设备验证时间
        device = Device.query.filter_by(machine_code=machine_code).first()
        if device:
            device.update_verify_time()

        # 获取最新版本信息
        latest_version = Version.query.filter_by(
            product_id=software_id,
            publish_status=1
        ).order_by(Version.create_time.desc()).first()

        response_data = {
            'license_key': license_obj.license_key,
            'type': license_obj.type,
            'type_name': '试用' if license_obj.is_trial() else '正式',
            'expire_time': license_obj.expire_time.isoformat() if license_obj.expire_time else None,
            'remaining_days': license_obj.get_remaining_days(),
            'product_name': product.product_name,
            'activate_time': license_obj.activate_time.isoformat() if license_obj.activate_time else None
        }

        # 添加版本信息
        if latest_version:
            current_version = request.json.get('software_version', '1.0.0') if request.json else '1.0.0'
            response_data.update({
                'new_version': latest_version.version_num,
                'download_url': latest_version.download_url,
                'force_update': latest_version.is_force_update(),
                'update_log': latest_version.update_log,
                'need_update': latest_version.version_num != current_version
            })

        return jsonify({
            'success': True,
            'message': '验证成功',
            'data': response_data
        })

    except Exception as e:
        current_app.logger.error(f"卡密验证失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': '服务器内部错误'
        }), 500

@api_bp.route('/auth/activate', methods=['POST'])
def activate_license():
    """激活卡密接口"""
    try:
        data = request.get_json()
        if not data:
            return jsonify({
                'success': False,
                'message': '请求数据为空'
            }), 400

        software_id = data.get('software_id')
        license_key = data.get('license_key')
        machine_code = data.get('machine_code')
        software_version = data.get('software_version', '1.0.0')

        # 验证必填参数
        if not all([software_id, license_key, machine_code]):
            return jsonify({
                'success': False,
                'message': '缺少必要参数'
            }), 400

        # 查找产品
        product = Product.query.filter_by(product_id=software_id).first()
        if not product:
            return jsonify({
                'success': False,
                'message': '产品不存在'
            }), 404

        # 查找卡密
        license_obj = License.query.filter_by(
            license_key=license_key,
            product_id=software_id
        ).first()

        if not license_obj:
            return jsonify({
                'success': False,
                'message': '卡密不存在'
            }), 404

        # 激活卡密
        success, message = license_obj.activate(machine_code, software_version)
        if not success:
            return jsonify({
                'success': False,
                'message': message
            }), 400

        return jsonify({
            'success': True,
            'message': '激活成功',
            'data': license_obj.to_dict()
        })

    except Exception as e:
        current_app.logger.error(f"卡密激活失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': '服务器内部错误'
        }), 500

@api_bp.route('/auth/info', methods=['GET'])
def get_auth_info():
    """获取授权信息接口"""
    try:
        software_id = request.args.get('software_id')
        machine_code = request.args.get('machine_code')

        if not software_id or not machine_code:
            return jsonify({
                'success': False,
                'message': '缺少必要参数'
            }), 400

        # 查找设备
        device = Device.query.filter_by(
            machine_code=machine_code,
            status=1
        ).first()

        if not device:
            return jsonify({
                'success': False,
                'message': '设备未激活'
            }), 404

        # 查找关联的卡密
        license_obj = device.license
        if not license_obj or license_obj.product_id != software_id:
            return jsonify({
                'success': False,
                'message': '授权信息不匹配'
            }), 403

        # 检查授权状态
        if license_obj.is_expired():
            return jsonify({
                'success': False,
                'message': '授权已过期'
            }), 403

        # 返回授权信息
        return jsonify({
            'success': True,
            'data': {
                'license_key': license_obj.license_key,
                'type': license_obj.type,
                'type_name': '试用' if license_obj.is_trial() else '正式',
                'expire_time': license_obj.expire_time.isoformat() if license_obj.expire_time else None,
                'remaining_days': license_obj.get_remaining_days(),
                'activate_time': license_obj.activate_time.isoformat() if license_obj.activate_time else None,
                'last_verify_time': license_obj.last_verify_time.isoformat() if license_obj.last_verify_time else None
            }
        })

    except Exception as e:
        current_app.logger.error(f"获取授权信息失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': '服务器内部错误'
        }), 500

@api_bp.route('/auth/heartbeat', methods=['POST'])
def heartbeat():
    """心跳接口（用于在线验证）"""
    try:
        data = request.get_json()
        if not data:
            return jsonify({'success': False}), 400

        software_id = data.get('software_id')
        machine_code = data.get('machine_code')

        if not software_id or not machine_code:
            return jsonify({'success': False}), 400

        # 更新设备最后验证时间
        device = Device.query.filter_by(
            machine_code=machine_code,
            status=1
        ).first()

        if device:
            device.update_verify_time()

        return jsonify({'success': True})

    except Exception as e:
        current_app.logger.error(f"心跳处理失败: {str(e)}")
        return jsonify({'success': False}), 500